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PR tree-optimization/94574 - aarch64: ICE during GIMPLE pass:ccp 

In this PR the testcase ICEs because a BIT_INSERT_EXPR whose replaced bits are
not fully inside the container is generated. A size check is added to avoid
this kind of ICE.

gcc/ChangeLog:

	PR tree-optimization/94574
	* tree-ssa.c (non_rewritable_lvalue_p): Add size check when analyzing
	whether a vector-insert is rewritable using a BIT_INSERT_EXPR.

gcc/testsuite/ChangeLog:

	PR tree-optimization/94574
	* gcc.dg/pr94574.c: New test.
This commit is contained in:
Yang Yang 2020-04-14 19:42:23 +00:00 committed by Richard Biener
parent 438ffa2a8f
commit f65cecabc3
4 changed files with 29 additions and 1 deletions
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6
gcc/ChangeLog
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@ -1,3 +1,9 @@
2020-04-14 Yang Yang <yangyang305@huawei.com>
PR tree-optimization/94574
* tree-ssa.c (non_rewritable_lvalue_p): Add size check when analyzing
whether a vector-insert is rewritable using a BIT_INSERT_EXPR.
2020-04-14 H.J. Lu <hongjiu.lu@intel.com>
PR target/94561

5
gcc/testsuite/ChangeLog
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@ -1,3 +1,8 @@
2020-04-14 Yang Yang <yangyang305@huawei.com>
PR tree-optimization/94574
* gcc.dg/pr94574.c: New test.
2020-04-14 H.J. Lu <hongjiu.lu@intel.com>
PR target/94561

15
gcc/testsuite/gcc.dg/pr94574.c Normal file
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@ -0,0 +1,15 @@
/* { dg-do compile } */
/* { dg-options "-O2 -w -Wno-psabi" } */
typedef unsigned int v4si __attribute__((vector_size(16)));
typedef unsigned int v2si __attribute__((vector_size(8)));
/* The aliasing is somewhat dubious here, but it must compile. */
v2si
foo (v4si v)
{
v2si res;
*(v4si *) &res = v;
return res;
}

4
gcc/tree-ssa.c
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@ -1543,7 +1543,9 @@ non_rewritable_lvalue_p (tree lhs)
&& known_gt (wi::to_poly_offset (TYPE_SIZE_UNIT (TREE_TYPE (decl))),
mem_ref_offset (lhs))
&& multiple_of_p (sizetype, TREE_OPERAND (lhs, 1),
TYPE_SIZE_UNIT (TREE_TYPE (lhs))))
TYPE_SIZE_UNIT (TREE_TYPE (lhs)))
&& known_ge (wi::to_poly_offset (TYPE_SIZE (TREE_TYPE (decl))),
wi::to_poly_offset (TYPE_SIZE (TREE_TYPE (lhs)))))
{
poly_uint64 lhs_bits, nelts;
if (poly_int_tree_p (TYPE_SIZE (TREE_TYPE (lhs)), &lhs_bits)